An approved assembly which prevents water that has been delivered to a property from flowing back into the City water distribution system (premise isolation) or from reversal of flow within premise piping (point of hazard isolation).

The Chief Engineer is a Licensed Professional Engineer in charge of the Bureau engineering staff. The Chief Engineer, or the Chief Engineer's designee, is responsible for establishing, maintaining, and enforcing engineering and technical standards for design and construction of the water system.

The elected member of the Portland City Council responsible for the supervision and control of the affairs and property of the Bureau, as authorized in Chapter 2 of The Charter of the City of Portland.

The pipe or tubing, fittings, and valves necessary to conduct water from the distribution main to and through the meter and to the property line. Where the water service meter is on private property, service connection is the pipe or tubing, fittings, and valves necessary to conduct water from the distribution main to and through the meter and the angle meter coupling on service connections of 1-inch or less and through the downstream meter valve on service connections of more than 1-inch.